We've tried on a few computers and friends computers but can't reproduce the issue, it works fine. One friend mentioned he needed to get the correct version of DirectX for it to run. Are the judges downloading directly from itch.io or all sharing a previous download? Maybe the judges are all using a corrupt download. I built using the version of Unreal on the AI lab computers (4.15.3), I can try compiling with the newest unreal engine (4.17.1) and submitting a second download to our game page.